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Home >> Suzuki >> 2001 >> Swift GL, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0141: Heated Oxygen Sensor No. 2 Heater Circuit Malfunction >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

  1. Perform DTC CONFIRMATION TEST . If DTC P0141 is set, go to next step. If DTC P0141 is not set, problem is intermittent. System is okay at this time. See TROUBLE SHOOTING - NO CODES article.
  2. Start engine and allow it to reach normal operating temperature. Turn ignition off and on. Backprobing, measure voltage between ground and PCM 26-pin connector C21 terminal No. 4 (Pink wire). See Figure. Reading should be more than 10 volts. Start engine and allow it to idle. One minute after engine start, reading should be less than 1.9 volts. If readings are not as specified, go to next step. If readings are as specified, problem is intermittent. System is okay at this time. See TROUBLE SHOOTING - NO CODES article.
  3. Turn ignition off. Disconnect HO2S No. 2 connector. Check for poor terminal contact at HO2S No. 2 connector. If poor terminal contact is found, repair as necessary and go to DTC CONFIRMATION TEST . If terminal contact is okay, measure resistance between HO2S No. 2 terminal No. 3 (Pink wire) and No. 4 (Black/White wire). If resistance is 11.7-14.3 ohms at about 68°F (20°C), go to next step. If resistance is not 11.7-14.3 ohms at about 68°F (20°C), replace HO2S No. 2 and go to DTC CONFIRMATION TEST .
  4. Disconnect PCM 26-pin connector C21. Check for poor terminal contact at PCM 26-pin connector C21. If poor terminal contact is found, repair as necessary and go to DTC CONFIRMATION TEST . If terminal contact is okay, check for open or short to ground in Pink wire between HO2S No. 2 and PCM 26-pin connector C21 terminal No. 4. See Figure. Repair as necessary. If wire is okay, replace PCM and go to DTC CONFIRMATION TEST .
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